Bag and method of making same



May 21, '1935. J. MfMuNsoN 2,001,934

BAG AND METHOD 0F MAKING SAME Filed Sept. 6, 1952 2 Sheets-Sheet 1 Q it/8% WWW;

Gttorneg S May 21, 1935. 3 J. M. MUNSON. 2,001,934

I I BAG AND METHOD OF MAKING SAME Filed Sept. 6, 1952 2 Sheets-Sheet 2 7i V A Zhwentor JOHN N/TCfi/Ell fill/WON attorneys Patented May 21, 1935BAG AND METHOD OF MAKING SAME John Mitchell Munson, Lakewood, Ohio,assignor to The Munson Bag Company, Cleveland, Ohio,

a corporation of Ohio Application September 6, 1932, Serial No. 631,845

7 Claims.

This invention relates to bags and a method of making same, and isconcerned primarily with bags having a finger tab at the upper or openend thereof.

Heretofore, as far as I am aware, it has been the accepted practice toform a tabportion by cutting a segment out of the top of the front panelof the bag, leaving the top portion of the back panel free to be grippedby the fingers when 10 opening the bag. This practice, among otherthings, entailed a waste of stock, reduced the capacity of the bag, andin certain instances entailed a separate cutting operation. While theobjection as to waste may not appear of much consequence when the bagmaterial is comprised solely or chiefly of paper, it becomes quite anitem when the material cut away is, for example, cellophane.

I have devised a method of producing a tab type of bag which not onlyovercomes the foregoing objections but results in a tab which issuperior to the conventional type, since it projects above the top ofthe bag and can be easily grasped by the fingers and does not have atendency to cause tearing of the bag when opening the latter by theusual snapping action of the forearm. In my method, the tab iscut outfrom one end of a bag blank and the cut-out portion which defines thetab is utilized in making the bottom fold of the bag made up from thesucceeding blank and facilitates formation of such fold. Briefly, themethod results in a superior bag with a reduction in cost ofmanufacture.

I have also devised a step in the tube forming operation which reducesto a minimum the tendency of a machine to clog or jam and alsotacilitates cutting of the tube into suitable bagv lengths or blanks.

To obtain a more complete understanding of the method and the advantagesto be obtained by its adoption, reference is had to the accompanying.drawings, wherein:

Figs. 1 and 2 are diagrammatic views in side elevation and plan of suchparts of a tube forming and cutting machine as will facilitate anunderstanding of this phase of my method;

Fig. 3 is a top plan view of a tube just prior to complete detachment ofthe severed form by the pick up rolls;

Figs. 4 and 5, respectively, are bottom and top plan views of a form orblank after passing through the tube forming and cutting mechanism andready for the initial bottom folding operation;

Figs. 6, 7 and 8 illustrate the successive steps of the bottom foldingoperation.

First referring to Figs. 1 and 2, 5 designates diagrammatically a rollof stock, 6 a glue pot and l a glue wheel for the longitudinal seam ofthe bag, 8 a former guide roll, 9 the tube former or mandrel, l drawrolls, II the former tail and I2 and I3 the top and bottom knives whichcoact therewith, and I4 the pick-up rolls for discharging the completedblank ready for the bottom folding operation.

Up to the former tail, the parts may be of 10 conventional design, thestock S being taken from the roll 5, the glue applied to thelongitudinal seam l5 by the Wheel 1, then passing over the guide roll 8and the former 9, the sides of the tube being lapped over and glued asthe 5 latter passes through the draw rolls Ill.

The top surface of the former tail is provided with slots [5 and I6 andthe bottom surface with a slot II, the latter being given the contour ofthe tab of the bag, and the knives I2 .20 and iii are shaped to coactwith these slots, as will be understood. It will be seen from thecontour of the slots l5 and it that longitudinal slits l2 note Figs. 3,4 and 5, will be formed in the top panel of the bag, leaving a flap I8,and that the tube will be severed (not completely in the present method)transversely in the slots l5 and arctuately and transversely in theslots H, the arcuate cut defining a tab I9 at the top of the bag and acut-out segment 20 at the bottom thereof.

The knives l2 and I3 are dimensioned so as to cut through all but afraction of the tube, as indicated at 2|, Fig. 3, and the peripheralspeed of the pick-up rolls I4 is gauged so as to be slightly in excessof that of the draw rolls Ill. The result is that each blank is grippedby the rolls I4 and the tube is constantly maintained at a slighttension while being acted on by the knives l2 and I3. The uncut portionon each side of the tube need be but slight, or just suflicient tomaintain a certain'amount of pull on the tube. When this pull or tensionbecomes greater than the tensile strength of the uncut portions 2|, theblanks are separated and kicked out or discharged by the rolls ll.

Practical experience has shown that this method results in a cleancutting action by the knives I2, I 3 and eliminates irksome jamming orclogsing and distortion of the blanks frequently encountered in machineswhere the blanks are completely severed by the knives, leaving theoutgoing end of the tube loose and wherein the cut blanks are in a sensepushed into the pick-up rolls instead of being pulled by said rolls. 5

The blank shown in Figs. 4 and 5 has been formed and cut and is readyfor the folding mechanism. Since such mechanism may be of any suitabletype, it is not shown. The blank is preferably given a diamond fold asshown in Figs. 6, 7 and 8, although it will be understood that certainvariations in fold may be adopted for the purpose of advantageouslyutilizing the flap l 8 and/or cut out portion 20. However, since thistype of fold is well understood in the art, it serves as convenientmeans of illustrating the method.

In making the fold, the bottom side wall which carries the fiap I8 isfolded back on the line 22 and at the same time the sides are collapsedinwardly and creased on the lines 23, suitable glue or adhesivesubstance being applied, as for example, at 24.

The next step is shown in Fig. 7, the flap l8 being folded on the line25 and ironed down and glued in place. The final step is shown in Fig.8, the bottom portion of the opposite side wall being folded on the line26, ironed down and glued in place.

It will be seen that the tab I9 is not only superior to the cut-out typeof tab but causes no .waste of material since the cut-out portion whichdefines the tab is used in the bottom fold where, if anything, it is anasset since it facilitates the folding back of the fiap l8. Furthermore,the flap I8, being of single-wall thickness, makes a neater fold and canbe more easily glued than the bulky double wall which would otherwise bepresent and which has a tendency to spring back when ironed down onfresh glue.

It will be understood that advantages other than those enumerated may bederived from my method and that certain variations in procedure andsequence of steps may be practiced without departing from the scope ofthe invention as defined by the appended claims.

I claim:-

. 1. In the manufacture of bags, the method which, consists in forming acontinuous tube from stock material, severing the tube into a series ofblanks in such manner as to define a projecting tab at one end of theblank and a cut-out portion defining the tab at the opposite endof theblank, and then forming a bottom fold at the end of the blank having thecut-out portion.

2. In the manufacture of bags, the method which consists in forming acontinuous tube from stock material, severing the tube transversely intoa series of blanks, the one side wall of the tube at the point ofseverance being formed with a projection defining a tab, and utilizingthe end of each blank which is formed with a projection as the open endof a bag and the meeting end of the adjacent blank from which theprojection is cut as the bottom of a bag.

3. In the manufacture of bags, the method which consists in forming acontinuous tube from stock material, severing the tube into a series ofblanks having a projection at one end thereof defining a tab and a slitportion at the opposite end defining a folding flap, and forming abottom fold at the ends of the blanks having said flap.

4. In the manufacture of bags, the method which consists in severing aseries of blanks from a continuous tube, the cut on one side of the tubedefining a tab and the cut on the other side of the tube defining afolding flap, then forming a bottom fold at the end of the blank formedwith a flap, and utilizing the meeting and of the adjacent blank as thetop of another bag.

5. In the manufacture of bags, the method which consists in severing acontinuous tube into a series of blanks, one side of the tube being cuttransversely and arcuately to define a tab, and the opposite side of thetube being cut transversely and also slit substantially longitudinallyto define a folding flap, forming a bottom fold at the slit end of theblank and utilizing the adjacent end of the succeeding blank as the topof another bag.

6. In the manufacture of bags, the method which consists in forming acontinuous tube from stock material, severing the tube into a series ofblanks, one wall of the tube being cut transversely and also out ofalignment to the transverse to define a tab and the other wall of thetube being cut transversely and also slit at substantially right anglesto the transverse to define a folding flap, and forming a bottom fold atthe slit end of the blank and utilizing the meeting end of the adjacentblank as the open end of another bag.

'7. The method of manufacturing bags having finger tabs at the open endthereof, which consists in fashioning a series of blanks with one sidewall of a blank projecting beyond the opposite side wall thereof todefine a tab, slitting the opposite end of the blank to define a foldingflap, and forming a bottom fold with said flap.

JOHN M. MUNSON.

